Select - Indexed: prints the value of the integer and whether it matches its index in the array : Index « LINQ « C# / CSharp Tutorial

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public class MainClass {
    public static void Main() {

        int[] numbers = { 5, 4, 1, 3, 9};

        var numsInPlace = numbers.Select((num, index) => new { Num = num, InPlace = (num == index) });

        foreach (var n in numsInPlace) {
            Console.WriteLine("{0}: {1}", n.Num, n.InPlace);
        }
    }
}